NEW
Font size
WorksheetsChemical Reactions Review
Total questions: 50
Worksheet time: 27mins
The products of a chemical reaction are on the
Left side (Products → Reactants)
Right side (Reactants → Products)
The reactants of a reaction are on the
Left side (Reactants → Products)
Right side (Products → Reactants)
The law of conservation of mass states that
The mass of a system (reaction) increases from beginning to end
The mass of a system (reaction) stays the same from beginning to end
The mass of a system (reaction) decreases from beginning to end
Is this equation balanced?
(Are there the same amount of H and O atoms on both sides of the equation?)
H2O2→ H2O + O2
Yes
No
A precipitate is
Rain
Snow
A solid formed in a chemical reaction
Condensation formed in a chemical reaction
Chemical reactions happen when
Liquids evaporate
Bonds break or form
Chemicals get heated
Bonds get stretched
In the diagram, letter D represents a
subscript
coefficient
product
equation
In the diagram, letter E represents a
subscript
coefficient
product
equation
Which is the product in the reaction shown?
Al2O3
Al
O2
How does the mass of products compare to the mass of reactants in a chemical reaction?
reactants = products
reactants > products
reactants < products
In the reaction shown below, 12 grams of AB break down into 8 grams of product A and an unknown amount of product B.
Using the law of conservation of mass, what will the mass of product B be?
4 grams
8 grams
12 grams
20 grams
The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?
How many Oxygen (O) atoms are in one molecule of 2C2HO8Cl2
2
16
8
5
The process in which one or more substances are changed into new substances with different chemical and physical properties is called a _____
chemical equation
chemical reaction
stoichiometry
physical change
What are the original substances in a chemical reaction called?
solutions
reactants
products
polyatomic ions
What are the NEW substances produced in a chemical reaction called?
reactants
products
polyatomic ions
solutions
Which of the following is not an indication of a chemical reaction taking place.
color change
odor change
precipitate formation
evaporation
Balance the following equation.
Al + S--> Al2S3
2,2,1
2,4,1
2,3,1
3,1,1
Identify the product(s) in this chemical reaction.
Ca + F2 --> CaF2
Ca
F2
CaF2
Ca and F2
Select the coefficients to balance the following equation.
___Al + ___Ag(NO3) --> __Ag + __Al(NO3)3
3,1,1,3
1,3,3,1
1,2,2,1
2,1,1,2
Anything that has mass and takes up space
Matter
Atom
Molecule
Crystal
two or more atoms bonded together
Matter
Atom
Molecule
Crystal
A substance made up of atoms of two or more different elements joined by chemical bonds
Compound
Coefficient
Subscript
Chemical Formula
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
Compound
Coefficient
Subscript
Chemical Formula
Symbols that show the elements in a compound and the ratio of atoms
Compound
Coefficient
Subscript
Chemical Formula
characteristics used to describe a substance
Properties
Chemical Property
Physical Property
Chemical Reaction
the amount of matter in an object
Product
Conserve
Mass
Law of Conservation of Matter
What is a product (in chemical reactions)?
Something a company will try to sell to you
Also a potato
When the mitosis space-time folds into a tetrahedron flux-capacitor
The substance(s) that are created after a chemical reaction
What is an atom?
Water is an atom
The Hydrogen (H)s and the Oxygen (O)s are atoms
The H2O is an atom
None of these are atoms
What is a molecule?
The H2O is a molecule
The Hydrogen (H)s and the Oxygen (O)s are molecules
The H2O is an atom
None of these are molecules
According to the Law of Conservation of Mass,
matter is always created in a chemical reaction
matter is always destroyed in a chemical reaction
matter is created and then destroyed in a chemical reaction
matter is not created or destroyed in a chemical reaction
The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?
When carbon and oxygen combine chemically, the mass of the product is
greater than the mass of the carbon plus the mass of the oxygen
equal to the mass of the carbon plus the oxygen
equal to the mass of the carbon
less than the mass of the carbon
The flask and its contents had a mass of 120 grams before the experiment. What would be the mass of the flask and its contents after the experiment?
0 g
60 g
120 g
240 g
In which of the following examples has a chemical reaction occurred?
After putting liquid batter into a hot pan, the batter solidifies and begins to turn brown.
After turning on a blender filled with fruits, the fruit is chopped up and mixed together.
After taking a tray filled with ice cubes out of the freezer, the cubes begin to melt.
After adding a spoonful of sugar to a mug of hot coffee, the sugar dissolves completely.
A physical reaction is:
When the atoms in a substance rearrange to form a new substance
Formed when two or more atoms bond together
When a substance is changed but the atoms are NOT rearranged.
A material made by chemically altering natural materials
Matter can be neither...
destroyed but it can change form.
created nor destroyed.
created nor destroyed. It just changes form.
created.
Cooking an egg is..
a chemical reaction
a physical reaction
boiling water to make hot cocoa is...
a chemical reaction
a physical reaction
Which of the following is NOT a sign of a chemical reaction occurring?
Change in temperature
Change in color
Production of gas (bubbles)
Change of state
